CITROEN DS4 Owner's Handbook Manual page 152

Mats
Removable carpet protection.
Fitting
When fitting the mat for the first time, on the
driver's side use only the fixings provided in
the wallet attached.
The other mats are simply placed on the carpet.
Removal
To remove the mat on the driver's side:
move the seat as far back as possible,
unclip the fixings,
remove the mat.
Refitting
To refit the mat on the driver's side:
position the mat correctly,
refit the fixings by pressing,
check that the mat is secured correctly.
To avoid any risk of jamming of
the pedals:
- only use mats which are suited
to the fixings already present in
the vehicle; these fixings must be
used,
- never fit one mat on top of another.
The use of mats not approved by
CITROËN may interfere with access to
the pedals and hinder the operation of
the cruise control/speed limiter.